1、定义
定义算法框架,并将一些步骤的实现延迟到子类。
通过模板方法,子类可以重新定义算法的某些步骤,而不用改变算法的结构。
2、结构实现
3、示例
冲咖啡和冲茶都有类似的流程,但是某些步骤会有点不一样,要求复用那些相同步骤的代码。
public abstract class CaffeineBeverage {
final void prepareRecipe() {
boilWater();
brew();
pourInCup();
addCondiments();
}
abstract void brew();
abstract void addCondiments();
void boilWater() {
System.out.println("boilWater");
}
void pourInCup() {
System.out.println("pourInCup");
}
}
public class Coffee extends CaffeineBeverage {
@Override
void brew() {
System.out.println("Coffee.brew");
}
@Override
void addCondiments() {
System.out.println("Coffee.addCondiments");
}
}
public class Tea extends CaffeineBeverage {
@Override
void brew() {
System.out.println("Tea.brew");
}
@Override
void addCondiments() {
System.out.println("Tea.addCondiments");
}
}
public class Client {
public static void main(String[] args) {
CaffeineBeverage caffeineBeverage = new Coffee();
caffeineBeverage.prepareRecipe();
System.out.println("-----------");
caffeineBeverage = new Tea();
caffeineBeverage.prepareRecipe();
}
}
4、结果
boilWater
Coffee.brew
pourInCup
Coffee.addCondiments
boilWater
Tea.brew
pourInCup
Tea.addCondiments